Callens – founded by Willy Callens in West Flanders (Belgium) in 1966 – is the market leader in industrial heating and air technologies. Since 2003, it has been managed by the second generation: Annick Callens and Windy Moerman. The family rooted company supports industrial firms in their transition to a low-emission future while their systems remain competitive, efficient and reliable. Today, Callens has grown into an international group of companies: the Callens Group. It consists of four complementary businesses: Callens (Belgium), Optimum (worldwide), Jonker (Netherlands) and Cometi (France), and offers advanced expertise in engineering, construction and service via 13 strategic branches. The group completes more than 100 turnkey projects worldwide a year.
| Website | http://www.callens.eu |
| Revenue | $12.6 million |
| Employees | 276 (144 on RocketReach) |
| Founded | 1966 |
| Technologies |
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| Industry | Mechanical or Industrial Engineering |
| Keywords | Heating Systems, Ventilation Systems, Process Industry Solutions, Industrial Heating, Industrial Ventilation, Thermal Engineering, Air Technology, Climate Control Systems, Hvac Systems, Process Automation, Industrial Automation, Integrated Systems, Building Automation, Energy Efficiency, Industrial Energy, Sustainable Solutions, Process Optimization, Industrial Equipment, Manufacturing Solutions, Plant Engineering |
| Competitors | De Vlaamse Waterweg nv, Aquafin, Witteveen+Bos, Kiwa, EnviroServe, Recycling Lives Ltd, Vlaamse Landmaatschappij, Eurofins, Bureau Veritas Group, DRW +28 more (view full list) |
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The Callens annual revenue was $12.6 million in 2026.
Windy Moerman is the CEO of Callens.
144 people are employed at Callens.